Windows > Single Window Mode.
Windows > New Toolbox
Windows > Dockable Dialogs > Tool Options
It is hard to convey how much more comfortable I feel with the program with these tiny settings changes. I wonder how many other people are in the same boat as I.
I spend a lot of time in a grid style interface, so it is great to see:
* View > Show Grid
* View > Snap to Grid
Click once somewhere. Hold shift to draw a point to point line. Hold shift and control to have wider snapping of angles and click again, hold control and shift to get 15 Degree increment angles.
I will use Gimp a lot more now. Previously I was trying to use Pinta, but it would crash regularly on me making it almost unusable.